RAC一些常见用法（五）
2018-12-28 本文已影响0人
dandelionYD
本demo详见github
1.常见的用法
myRedView.h
#import <UIKit/UIKit.h>
@interface myRedView : UIView
@end
myRedView.m
#import "myRedView.h"
@implementation myRedView
-(instancetype)initWithFrame:(CGRect)frame{
if([super initWithFrame:frame]){
self.backgroundColor = [UIColor redColor];
UIButton *btn = [UIButton new];
btn.frame = CGRectMake(0, 0, 40, 40);
[btn setBackgroundColor:[UIColor greenColor]];
[self addSubview:btn];
[btn addTarget:self action:@selector(btnClick) forControlEvents:UIControlEventTouchUpInside];
}
return self;
}
-(void)btnClick{
NSLog(@"点击了红色view中的按钮");
// 通知控制器做事情
}
@end
RACCommonUsages.h
#import <UIKit/UIKit.h>
@interface RACCommonUsages : UIViewController
@end
RACCommonUsages.m
#import "RACCommonUsages.h"
#import "myRedView.h"
#import <ReactiveObjC.h>
@interface RACCommonUsages ()
@property (nonatomic,assign)int age;
@end
@implementation RACCommonUsages
- (void)viewDidLoad {
[super viewDidLoad];
self.age = 0;
[self RAC_Delegate];
[self RAC_KVO];
[self RAC_ObserveAction];
[self RAC_ObserveTextFieldAndNotification];
[self ARC_MoreSituations];
}
//控制器要监听红色的view上的button的点击
-(void)RAC_Delegate{
// 1.RAC替换代理
// RAC:判断下一个方法有没有调用,如果调用了就会自动发送一个信号给你
// 只要self调用viewDidLoad就会转换成一个信号
// 监听_redView有没有调用btnClick,如果调用了就会转换成信号
myRedView *v = [[myRedView alloc]initWithFrame:CGRectMake(0, 100, 100, 200)];
[self.view addSubview:v];
[[v rac_signalForSelector:@selector(btnClick)] subscribeNext:^(RACTuple * _Nullable x) {
NSLog(@"控制器知道,点击了红色的view");
}];
}
-(void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event{
self.age++;
NSLog(@"点击增的值：%d",self.age);
}
-(void)RAC_KVO{
// 2.KVO
// 监听哪个对象的属性改变
// 方法调用者:就是被监听的对象
// KeyPath:监听的属性
// 把监听到内容转换成信号
[[self rac_valuesForKeyPath:@"age" observer:self] subscribeNext:^(id _Nullable x) {
NSLog(@"监听的值%@",x);
}];
}
-(void)RAC_ObserveAction{
UIButton *btn = [UIButton new];
btn.frame = CGRectMake(20, 400, 40, 40);
[btn setBackgroundColor:[UIColor lightGrayColor]];
[self.view addSubview:btn];
//3.监听事件
//只要产生UIControlEventTouchUpInside就会转换成信号
[[btn rac_signalForControlEvents:UIControlEventTouchUpInside] subscribeNext:^(__kindof UIControl * _Nullable x) {
NSLog(@"点击了btn");
}];
}
-(void)RAC_ObserveTextFieldAndNotification{
UITextField *textF = [[UITextField alloc]init];
textF.borderStyle = UITextBorderStyleRoundedRect;
textF.frame = CGRectMake(200, 100, 100, 40);
[self.view addSubview:textF];
//4.监听通知
// 只要发出这个通知,又会转换成一个信号
[[[NSNotificationCenter defaultCenter] rac_addObserverForName:UIKeyboardWillShowNotification object:nil] subscribeNext:^(id x) {
NSLog(@"弹出键盘");
}];
//5.监听文本框文字改变
// 获取文本框文字改变的信号
[textF.rac_textSignal subscribeNext:^(id x) {
NSLog(@"%@",x);
}];
}
//6.两种（多种）情况都有数据的时候才去做相应的事情
-(void)ARC_MoreSituations{
// 创建热门商品的信号
RACSignal *signalA = [RACSignal createSignal:^RACDisposable *(id<RACSubscriber> subscriber) {
// 处理信号
NSLog(@"请求热门商品");
dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(3.0 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
// 发送数据
[subscriber sendNext:@"热门商品"];
});
return nil;
}];
// 创建热门商品的信号
RACSignal *signalB = [RACSignal createSignal:^RACDisposable *(id<RACSubscriber> subscriber) {
// 处理信号
NSLog(@"请求最新商品");
dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(1 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
// 发送数据
[subscriber sendNext:@"最新商品"];
});
return nil;
}];
// RAC:就可以判断两个信号有没有都发出内容
// SignalsFromArray:监听哪些信号的发出
// 当signals数组中的所有信号都发送sendNext就会触发方法调用者(self)的selector
// 注意:selector方法的参数不能乱写,有几个信号就对应几个参数
// 不需要主动订阅signalA,signalB,方法内部会自动订阅
[self rac_liftSelector:@selector(updateUIWithHot:new:) withSignalsFromArray:@[signalA,signalB]];
}
// 更新UI
- (void)updateUIWithHot:(NSString *)hot new:(NSString *)new
{
NSLog(@"更新UI");
}
-(void)dealloc{
NSLog(@"%s",__FUNCTION__);
}
@end
2.RAC常见的宏
#import "RACCommonDefines.h"
#import <ReactiveObjC.h>
@interface RACCommonDefines ()
@property (nonatomic,strong)UITextField *textF;
@property (nonatomic,strong)UILabel *showLab;
@end
@implementation RACCommonDefines
- (void)viewDidLoad {
[super viewDidLoad];
self.textF = [[UITextField alloc]initWithFrame:CGRectMake(20, 100, 300, 40)];
self.textF.borderStyle = UITextBorderStyleRoundedRect;
[self.view addSubview:self.textF];
self.showLab = [[UILabel alloc]initWithFrame:CGRectMake(20, 200, 300, 40)];
[self.view addSubview:self.showLab];
self.showLab.backgroundColor = [UIColor redColor];
[self RAC_define];
[self RAC_KVO];
[self RAC_RACTuple];
}
//RAC宏
-(void)RAC_define{
RAC(self.showLab, text) = self.textF.rac_textSignal;
/*
[self.textF.rac_textSignal subscribeNext:^(id x) {
self.showLab.text = x;
}];
*/
}
-(void)RAC_KVO{
[RACObserve(self.showLab, text) subscribeNext:^(id x) {
NSLog(@"KVO监听文本的变化%@", x);
}];
}
-(void)CyclicReferences{
/*
@weakify(self);
@strongify(self);
*/
}
/*
* 元祖
* 快速包装一个元组
* 把包装的类型放在宏的参数里面,就会自动包装
*/
-(void)RAC_RACTuple{
RACTuple *tuple = RACTuplePack(@1,@2,@4);
// 宏的参数类型要和元祖中元素类型一致， 右边为要解析的元祖。
RACTupleUnpack_(NSNumber *num1, NSNumber *num2, NSNumber * num3) = tuple;// 4.元祖
// 快速包装一个元组
// 把包装的类型放在宏的参数里面,就会自动包装
NSLog(@"%@ %@ %@", num1, num2, num3);
}
-(void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event{
[self.view endEditing:YES];
}
-(void)dealloc{
NSLog(@"%s",__FUNCTION__);
}
@end
3.发送验证码
#import "Demo.h"
#import <ReactiveObjC.h>
@interface Demo ()
@property (nonatomic,assign)int time;
@property (nonatomic,strong) RACDisposable *disposable;
@end
@implementation Demo
- (void)viewDidLoad {
[super viewDidLoad];
UIButton *btn = [[UIButton alloc]initWithFrame:CGRectMake(20, 100, 100, 60)];
[btn setBackgroundColor:[UIColor redColor]];
[btn setTitle:@"发送验证码" forState:UIControlStateNormal];
[btn addTarget:self action:@selector(reSendCode:) forControlEvents:UIControlEventTouchUpInside];
[self.view addSubview:btn];
}
-(void)reSendCode:(UIButton*)sender{
self.time = 15;
@weakify(self);
self.disposable = [[RACSignal interval:1.0 onScheduler:[RACScheduler mainThreadScheduler]] subscribeNext:^(NSDate * _Nullable x) {
@strongify(self);
self.time--;
NSString *btnText = self.time >0 ? [NSString stringWithFormat:@"%ds",self.time]:@"发送验证码";
[sender setTitle:btnText forState:(UIControlStateNormal)];
if(self.time>0){
sender.enabled = NO;
}else{
sender.enabled = YES;
[self.disposable dispose];//在我们取消订阅的那一刹那，帮我们打断了循环引用
}
}];
}
-(void)dealloc{
NSLog(@"%s",__FUNCTION__);
}
@end
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